Flexible compositions based on vinyl chloride polymers comprising poly-ε-caprolactone

Abstract

The compositions contain, as vinyl chloride polymers, copolymers of vinyl chloride and of alkyl acrylates in which the alkyl radicals, consisting of linear or branched chains, contain from 1 to 10 carbon atoms and have an initial Shore A hardness not exceeding 85. They are suitable for the production of very diverse flexible articles, especially in the medical field (pouches for blood and for physiological fluids), the motor vehicle field (various profiles and seals) and the building industry (sealing sheets).

We claim: 
     
       1. Flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone, consisting essentially of vinyl chloride polymers chosen from the copolymers of vinyl chloride and of alkyl acrylates in which the alkyl radicals consist of linear or branched chains containing from 1 to 10 carbon atoms and of poly-ε-caprolactone wherein the initial Shore A hardness of the compositions does not exceed 85. 
     
     
       2. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 1, wherein the vinyl chloride copolymers contain from 5 to 45% by weight of monomer units derived from alkyl acrylates. 
     
     
       3. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 2, wherein the vinyl chloride copolymers contain from 15 to 35% by weight of monomer units derived from alkyl acrylates. 
     
     
       4. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 1 wherein the vinyl chloride copolymers contain up to 5% by weight of vinyl acetate. 
     
     
       5. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 1, wherein the alkyl radicals of the alkyl acrylates contain from 3 to 9 carbon atoms. 
     
     
       6. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 5, wherein the alkyl radicals of the alkyl acrylates contain from 4 to 8 carbon atoms. 
     
     
       7. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 1, wherein the vinyl chloride polymers are homogeneous binary copolymers of vinyl chloride and of alkyl acrylates in which the alkyl radicals contain from 4 to 8 carbon atoms. 
     
     
       8. The flexible compositions based on vinyl chloride polymers and on poly-ε-caprolactone according to claim 1, wherein the maximum molar concentration of poly-ε-caprolactone in the compositions is defined by the following formula: ##EQU2## in which: x PCl  denotes the maximum molar fraction, in monomer units of poly-ε-caprolactone (PCL), in the mixture of PCL plus vinyl chloride copolymer, x ACR  denotes the molar fraction of alkyl acrylate in the vinyl chloride copolymer, and   n denotes the number of carbon atoms in the alkyl radical of the alkyl acrylate.